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Date: Fri, 30 Mar 2007 18:12:18 -0400
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From: Lorn H Olsen <lorn@dynacomm.ws>
Subject: Re: Thielert Diesel Centurion 4.0

George,

I would like to ask a question about cooling a hot running engine. =20
When the P-51 had to be cooled, I have heard that by allowing the =20
heated exhaust to come out in the opposite direction from the =20
aircraft's motion that the expanded air compensated for the area that =20=

it took to cool the engine. Was this wrong? Could an exhaust be =20
designed to use the heated, expanded air to compensate for the =20
cooling drag?

For the Thielert, this is a moot point because we as experimental =20
pilots can't buy the engine but I am interested anyway.

Lorn

> From: "George Braly" <gwbraly@gami.com>
> Date: March 29, 2007 1:07:15 AM EDT
>
> Craig,
>
> There is =93another whole issue=94  with diesel engines .
> .
> .
> Because the CR is much higher.  So the exhaust expansion is more.   =20=

> OK=85.
>
> But if the CR is much higher then - - so is the peak internal =20
> cylinder pressure.
>
> OK=85 but that means that the bulk internal combustion gas =20
> temperatures are a lot higher.
>
> And that means that you get a LOT more BTU=92s transferred into the =20=

> cylinder head.
>
> And, as everybody with some diesel experience is aware - - they =20
> tend - - as a result to use rather large radiators.
>
> Because that heat  has to be dissipated - - - some way.
>
> HOW ?   Either through air cooling through cylinder fins or through =20=

> a radiator.
> .
> .
>
> Regards,  George


--
Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-345-0500, mailto:lorn@dynacomm.ws
LNC2, FB90/92, O-320-D1F, 1,300 hrs, N31161, Y47, SE Michigan